Ok so with the AWD system when inputs to the PCM are correct it sends a signal to the AWD module to command( pulse with modulation ) the Active Torque Coupling which brings in power to the rear end. How fast does this happen once the PCM sees the front wheels slipping (say at a launch at the drag strip) and sends signals for the AWD module to bring in the rear unit. With this being said if at the drag strip and you are able to command on the ATC to 100% which enguages the rear end right off the get go should you be able reduce what front tire spin you do get and launch harder. Just food for thought.

If your asking how fast the rear engages, there was a video I believe on this site where a guy captured a slow motion video of him launching in sand. I don't think the front completed half a revolution before the rear end engaged.

Using torque pro and the awd % gauge, while brake boosting it was pre-loading 75% to the rears before launch.

Rich

I believe this is the video you talking about

http://youtu.be/utkvSHeuzlo

Quote from: glock-coma on June 02, 2015, 05:20:29 PM
I believe this is the video you talking about

That would be the one - thanks Glock.

Quote from: glock-coma on June 02, 2015, 05:20:29 PM
I believe this is the video you talking about

http://youtu.be/utkvSHeuzlo

That might be the most annoying music I have ever heard in a video. That being said my count of front tire rotations might be different. I got 1.75 approximately before the rears started kicking sand.

Quote from: SVTPete83 on June 02, 2015, 08:18:09 PM

Quote from: glock-coma on June 02, 2015, 05:20:29 PM
I believe this is the video you talking about

http://youtu.be/utkvSHeuzlo

That might be the most annoying music I have ever heard in a video. That being said my count of front tire rotations might be different. I got 1.75 approximately before the rears started kicking sand.

Can't assume though that the rear tires aren't engaged before that point ...too many variables to consider.

Agreed. If the distribution was rear biased on a power break though,  the rears would spin right off the launch ya?

Quote from: SVTPete83 on June 02, 2015, 09:13:13 PM
Agreed. If the distribution was rear biased on a power break though,  the rears would spin right off the launch ya?

Correct this is definitely a front biased setup 

Quote from: Frozen Taurus on June 02, 2015, 09:15:04 PM

Quote from: SVTPete83 on June 02, 2015, 09:13:13 PM
Agreed. If the distribution was rear biased on a power break though,  the rears would spin right off the launch ya?

Correct this is definitely a front biased setup 

I get that. But then I read this...

Quote from: SHOnUup on June 02, 2015, 04:48:56 PM
Using torque pro and the awd % gauge, while brake boosting it was pre-loading 75% to the rears before launch.

Rich

75%, as in 75% of what the rear will take. Not 75% of the overall power.

Rich

Quote from: SHOnUup on June 02, 2015, 09:23:08 PM
75%, as in 75% of what the rear will take. Not 75% of the overall power.

Rich

I'm not sure that is correct on 2013+

I think we may have gotten the Gen 3 jtekt hence the addition of Torque vectoring.

Under heavy throttle, the majority of the power goes to the rear, at least initially.

During lift or very light throttle, the front isn't even active, and during any aggressive throttle input, the rear gets power first.

I feel like the FWD bias is only true if you are driving normally, hammer it and its a completely different animal.

Pretty much everything I felt going on in the 2013 and 2015 is backed up with the new gauge. People love to hate on our AWD, but I think it is a marvel of technology.

The video may not be "brake boosting" either. I noticed on my gauge I will not get power transfer to the rear as fast unless I brake boost.

I have managed to slide the tail out a little under hard throttle into corner. So I know there is enough power there to spin the tires slightly.

I can understand that you can send power to the rear via the torque coupling. But the drive shaft is driven by the PTU and the PTU is driven by the right side cv shaft. So how would you send LESS power to the front and more to the rear if the rear is driven by the front?
Unless there's some kind of active braking involved like in the Acura's SHAWD which I don't think the 13+ have.

Here's another launch. 13 SHO https://youtube.com/watch?v=hGRALV-vQ1c


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